#include "io.h"

query_cursor_t::query_cursor_t(std::istream &is)
  : is(is)
{
  _line = 0;
  _block_id = BAD_ID;
  ++(*this);
}

query_cursor_t &query_cursor_t::operator++()
{
  std::string line;
  if (is>>_id) {
    std::getline(is, line);
    if (line.size() > 0 && line[0] == ':') {
      _block_id = _id;
      ++(*this);
    } else {
      assert(_block_id != BAD_ID); // file should start with block id
    }
  } else {
    _block_id = BAD_ID;
  }
  return (*this);
}

/*
* Copyright (c) 2009 John Lees-Miller
* 
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
* 
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
* 
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/

